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This paper outlines the automatic construction of video processing solutions using multiple software components as opposed to traditional monolithic approaches undertaken by image processing experts. A combined top-down and bottom-up methodology was adopted for the derivation of a suitable level of granularity for a subset of image processing components that implement video classification, object detection, counting and tracking tasks. 90% of these components are generic and could be applied to any video processing task, indicating a high level of reusability for a spectrum of video analyses. Domain-specific video analysis approaches (that exploit combinations of the above components) are built by using an automatic workflow composition module that relies on decomposition-based planning and ontologies. Evaluation on a set of ecological videos indicate that the proposed approach is faster and more …